Stone assembly holder



June 30, 1964 w. G. cRowE STONE ASSEMBLY HOLDER Filed NOV. 13, 1961INVENTOR. Mam 6fm/f sli..V En:

ATToR NEYS United States Patent O 3,138,902 STONE ASSEMBLY HOLDERWilliam G. Crowe, Brighton, Mich., assigner to Mid-West AbrasiveCompany, Owosso, Mich., a corporation of Delaware Filed Nov. 13, 1961,Ser. No. 151,791 4 Claims. (Cl. 51-184.3)

The invention relates to honing tools and refers more speciically to ahoning stone assembly and a honing stone holder for holding the assemblyin position on a honing tool which are constructed to provide controlover the` width of the stone holder and to permit rapid replacement ofthe stone assemblies in the stone holder.

In the past honing tools have generally been provided with honing stoneholders which required removal of the stone holders from the tool bodyor head to permit replacement of a worn stone assembly. With such priorconstructions the honing stone assembly has generally been press fittedinto the holder or has been clamped therein either by means of setscrews which must be loosened and retightened when replacing a stoneassembly or by means of honing stone holder shoes for attaching thestone assemblies over stationary pins which must also be removed andreplaced in changing stone assemblies.

In addition the honing stone holders of the past have generally beenconstructed without regard to replacement or adjustable control of thewidth thereof so that on becoming loose due to normal Wear they havereduced the efficiency and quality of the honing and have generally beendiscarded or expensively plated with hard material which latteralternative causes excessive wear of the softer honing tool body.Further, with no control of the Width of honing stone holders entirelyseparate holders must be provided for use in conjunction with eachhoning tool having different Width tool holder slots.

Such methods of replacing honing stone assemblies in honing stoneholders are undesirable since excessive operator and machine time arelost during tool maintenance. The reduced efficiency of honing stoneholders due to wear thereof and the provision of separate stone holdersfor different honing tools is further uneconomical in that valuablematerials are wasted due to less than maximum use being made of eachtool holder.

It is therefore one of the objects of the present invention to providean improved honing stone assembly adapted to be removed from andreplaced in a honing stone holder mounted on a honing tool withoutremoving the stone holder from the honing tool.

Another object is to provide a honing stone holder including adjustablemeans for controlling the width thereof such as replaceable honing stoneholder members and shims for use with the honing stone holder members.

Another object is to provide a honing stone holder and honing stoneassembly which are extremely rigid.

Another object is to provide a honing stone holder comprising anelongated body member having a longitudinally extending slot therein andadapted to fit within an axial slot in the body of a honing tool, meansfor radially adjusting the elongated member relative to the tool bodyand means for releasably securing a honing stone assembly to the stoneholder.

Another object is to provide a honing stone holder and honing stoneassembly as set forth above wherein the means for retaining the honingstone assembly Within the stone holder comprises spring pressed balldetent means extending transversely of the slot in the stone holder andan elongated flange on the honing stone assembly secured in said slot bythe spring pressed ball detent means.

Another object is to provide a honing stone holder as set forth abovecomprising a holder body member having rice a longitudinally extendingrecess in one side thereof, and a retaining bar secured to said one sideof the holder body to provide said longitudinal slot in conjunction withsaid longitudinally extending recess into which the llange on the stoneassembly extends which retaining bar may be varied in size to adjust thewidth of the stone holder for normal Wear or different honing tool stoneholder slot widths.

Another object is to provide a honing stone holder and stone assemblywhich is simple in construction, economical to manufacture and efcientin use.

Other objects and features of the invention will become apparent as thedescription proceeds, especially when taken in conjunction with theaccompanying drawings, illustrating a preferred embodiment of theinvention, wherein:

FIGURE l is a partial elevation of the head of a honing tool having thestone holder of the invention secured therein.

FIGURE 2 is a section view of the head of the honing tool and stoneholder illustrated in FIGURE l taken substantially on the line 2-2 inFIGURE 1 and showing a stone assembly in position in the stone holderand in contact with a workpiece.

FIGURE 3 is a partial transverse section of the honing machine toolhead, stone holder and stone assembly illustra-ted in FIGURE 2 takensubstantially on line 3--3 in FIGURE 1.

FIGURE 4 is a perspective view of a stone assembly constructed inaccordance with the invention.

FIGURE 5 is an exploded perspective view of a stone holder constructedin accordance with the invention.

With reference to the figures of the drawing one embodiment of theinvention will now be disclosed.

As shown in FIGURES 1-3 a honing stone holder 10 is provided to secure ahoning stone assembly 12 to the body 14 of a honing tool. The honingstone holder 1li is provided with a replaceable retainer strip 16 topermit controlling the width of the honing stone holder to correct fornormal wear thereof and permit use of a single stone holder with honingtools having stone holder slots of different width. Further, as shownbest in FIG- URE 3, in accordance with the invention the stone assembly12 and stone holder 10 are so constructed that the stone assembly may beeasily removed from the stone holder and a new stone assembly replacedtherein without removing the stone holder from the honing tool body 14.

More specifically the honing tool body 14, as best shown in FIGURE 2,includes the outer cylindrical sleeve 18 having longitudinally extendingstone holder slots 20 therein spaced angnlarly thereabout. Annularflanges 24 are provided extending around sleeve 18 in axial spacedrelation to receive the thrust lug 27 in the annular recesses 2Stherebetween for holding the stone holder 10 in a predetermined axialposition as shown best in FIGURE l. Another slot 29 is provided axiallyof sleeve 18 within each of the slots 20 to receive the expansion plates26 of the honing tool.

As shown best in FIGURE 2 an expansion plate 26 is provided radiallyinwardly of each stone holder 10. The expansion plates 26 are adapted tomove radially inwardly and outwardly of the associated stone holderslots 28 to radially position the stone holders 10 and therefore thestone assemblies 12 carried thereby on axial movement of the ram 28having the conical portions 30 thereon due to engagement of the conicalportions 30 of the ram and mating surfaces 32 on the expansion plate 26.In operation it will be seen that on downward movement of the ram 28 asshown in FIGURE 2 each expansion plate 26 and therefore the stone holder10 and stone assembly 12 associated therewith will be caused to moveradially outwardly of the slot 20' in the tool head 14 in which it ispositioned against the biasing force of the E) garter springs 22 whichtendv to move the stone holders radially inwardly of the slots 20.

The stone holders 10 as best shown in FIGURE 5 are each in the form of abody comprising an elongated bar 34 having transverse recesses 36therein in which the garter springs 22 are received. A shallow recess 38extending longitudinally of the tool holder bar 34 is also provided inthe tool holder body member to provide an elongated socket or slot 50 inconjunction with the retainer plate or strip 16 to receive the flange 40of the stone assembly. The cylindrical recesses 42 spaced axially of thestone holder bar receive the coil springs 44 and detent ball 46 operableto secure the stone assembly 12 to the stone holder 1i).

The bar 34 of the stone holder 10 is further provided with a thrust lug27 as best shown in FIGURE 5. Thrust lug 27 is adapted to extend intorecess 2.5 in the sleeve 18 with the stone holder in position in a slotto prevent axial movement of the stone holder assembly relative to thetool body 14 in operation.

A retainer strip 16 is secured to the holder bar 34 over the recess 38by convenient means such as bolts 41 extending through the retainerstrip 16 and into the stone holder bar 34, as shown best in FIGURE l.Thus the stone holder bar 34 and retaining strip 16 form the elongatedslot 50 to receive the flange 40 of the stone assembly 12.

In conjunction with the honing stone holder 10 it will be particularlynoted that the retaining strip 16 may be removed therefrom on removal ofthe stone holder 10 from the slot 20 whereby the retaining strip may bereplaced by one of greater width to compensate for wear of the stoneholder in normal use or to permit the use of the stone holder with toolheads 14 having slots 20 of different Widths. Alternatively of coursethe original retainer strip 16 once removed may be plated to provide therequired width to compensate for Wear of the stone holder.

The honing stone assembly 12, as shown best in FIG- URE 4, comprises thehoning stone 52 bonded or otherwise secured to the Z-shaped angle basemember 54. As previously indicated the Z-shaped angle member 54 has oneleg forming the flange 40. The flange 40 is provided with shallowspherical recesses 56 as shown in FIGURE 3 into which the ball detents46 extend with the stone assembly 12 in assembly with the stone holder10 to retain the stone assembly 12 in position on the tool body 14. Theflange 40 may alternatively be provided with a longitudinally extendinggroove 57 therein into Which the detents 46 may extend as shown in FG-URE 4. The groove 57 has the manufacturing advantage that it need not belongitudinally aligned with the detents 46 as is the cast with therecesses 56.

With such construction it will be readily apparent that the simple stoneassembly 12 may be rapidly removed from the stone holder 10 Without thenecessity of removing the stone holder from the tool head 14 wherebyworn stone assemblies may be replaced with a minimum of lost machinetime and skilled labor. Y

Further, since the base member 54 of the stone assembly 12 and theentire stone holder 10 are constructed of metal such as steel thestructure of the invention is much more rigid than known stoneassemblies and stone holders constructed of plastic.

While one embodiment of the invention has been specically disclosed itwill be understood that other embodiments thereof are contemplated andit is the intention to include all such modifications as are suggestedby Crt the foregoing disclosure within the scope of the invention whichis indicated by the appended claims.

What I claim as my invention is:

1. In combination, a honing stone assembly comprising an elongatedabrasive element and an elongated flange projecting from said abrasiveelement, a holder for said honing stone assembly comprising a bodyadapted to carry said honing stone assembly on its front face, said bodyincluding an elongated bar of substantial width having an elongatedfront surface extending lengthwise thereof providing a seat for saidhoning stone assembly, an elongated strip removably secured to one sideof said bar to increase the width thereof, the thickness of said stripbeing substantially less than the Width of said bar, said bar having anelongated recess in the side thereof to `which said strip is secured,said recess and strip cooperating to define an elongated slot open atthe front of said body and shaped to receive said flange, and means forreleasably retaining said flange in said slot including a second recessin said bar opening into said elongated slot and a spring-pressed ballin said second recess biased toward said elongated slot to frictionallyengage said flange.

2. The combination defined in claim 1, wherein said flange has adepression therein so located as to be engaged by said ball when saidflange is received in said elongated slot as aforesaid.

3. The combination defined in claim 1, wherein said retaining meansincludes a third recess in said bar opening into said elongated slot ata point spaced longitudinally from said second recess, a spring-pressedball in said third recess biased toward said elongated slot tofrictionally engage said flange, and said flange has an elongated groovetherein extending lengthwise thereof and so located as to be engaged bysaid balls when said flange is received in said elongated slot asaforesaid.

4, A honing stone assembly holder adapted to releasably support a honingstone assembly in the slot of a honing tool, comprising a body adaptedto carry the honing stone assembly on its front face, said bodyincluding an elongated bar of substantial width having an elongatedfront surface extending lengthwise thereof pro viding a seat for thehoning stone assembly, an elongated strip removably secured to one sideof said bar to increase the width thereof, the thickness of said stripbeing substantially less than the width of said bar, said bar having anelongated recess in the side thereof to which said strip is secured,said recess and strip cooperating to dene an elongated slot open at thefront of said body and adapted to receive a portion of the honing stoneassembly, and means for releasably retaining said portion of the honingstone assembly in said elongated slot, said retaining means including asecond recess in said bar opening into a side of said elongated slot,and a springpressed ball in said second recess biased toward saidelongated slot.

References Cited in the tile of this patent UNITED STATES PATENTS1,601,813 Emerson Oct. 5, 1926 2,350,969 Sunnen June 6, 1944 2,751,726Klein June 26, 1956 2,787,097 Heath Apr. 2, 1957 2,823,498 Saunders Feb.18, 1958 2,903,828 Eldred Sept. 15, 1959 3,016,660 Gross Jan. 16, 19623,037,333 Stelmachowski June 5, 1962

4. A HONING STONE ASSEMBLY HOLDER ADAPTED TO RELEASABLY SUPPORT A HONINGSTONE ASSEMBLY IN THE SLOT OF A HONING TOOL, COMPRISING A BODY ADAPTEDTO CARRY THE HONING STONE ASSEMBLY ON ITS FRONT FACE, SAID BODYINCLUDING AN ELONGATED BAR OF SUBSTANTIAL WIDTH HAVING AN ELONGATEDFRONT SURFACE EXTENDING LENGTHWISE THEREOF PROVIDING A SEAT FOR THEHONING STONE ASSEMBLY, AN ELONGATED STRIP REMOVABLY SECURED TO ONE SIDEOF SAID BAR TO INCREASE THE WIDTH THEREOF, THE THICKNESS OF SAID STRIPBEING SUBSTANTIALLY LESS THAN THE WIDTH OF SAID BAR, SAID BAR